Tamsin is a distinctive girls' name in England & Wales, ranking #1016 in 2014 with 35 recorded births. The name reached its all-time peak in 1996 with 137 births ranking #271. Since 1996, the popularity has decreased by 74.5%. In 2014, approximately 1 in every 8,762 girls born was named Tamsin. FALLING Recent data shows the name is currently falling.